The return type for chooseEntry.

class ChooseEntryResult {
 static ChooseEntryResult _create(entry, fileEntries) {
   return new ChooseEntryResult._(_createEntry(entry), listify(fileEntries, _createFileEntry));
 }

 Entry entry;
 List<FileEntry> fileEntries;

 ChooseEntryResult._(this.entry, this.fileEntries);
}